This message will comes from the server, when client send something which server doesn't like. This may occur in many cases where server will send Alert messages. Please look at the Wireshark logs and check in which portion of TLS handshake the alert is coming.

HTTPBIN org server is expecting TLS extension [ server name indication ] from client. Httpbin_org is using new implementation of HTTP library so it has option where we can specify SNI and it is able to connect to server. https_client snippet application is using older implementation of HTTP library so it doesn’t have option to specify SNI and it won’t be able to connect to httpbin_org server. We recommend to use new version of HTTP library [ httpbin_org snippet ]. As older version of HTTP library may get deprecated.